Some companies have claimed/shown that dual layer burning is possible with x8 single layer burners through a firmware upgrade/modification. None of these companies have released such a firmware for the corresponding drives nor did they imply that they ever will. Honestly i am sure that they never will, at least not untill their true dual layer burners have been sold out.

The first true dual layer burners are not due for at least another 3-4 months, Sony has already announced its first model and an estimated price.